Recovery island: recovering and preparing cooking chemicals, producing green energy.
The evaporation plant processes side streams for combustion in the recovery boiler. All condensates generated in the evaporation plant are 100% re-useable in other departments of the mill, which leads to minimized use of fresh/raw water. There are no emissions from the evaporation plant – all streams are recycled or utilized in sulfuric acid production.
Recovery boilers produce more energy than they use, and they provide CO2-neutral electricity. The energy that is surplus to what the mill needs can be sold as green energy.
LimeLine white liquor plants recycle and reuse the process streams inside a mill. The white liquor plant completes the chemical recovery cycle, converting green liquor to white liquor.
CFB gasifiers produce combustible fuel gases for kilns (lime reburning kilns in pulp mills) and for the power industry. The lime kiln gasification system can replace 100% of oil/natural gas consumption in lime kilns by utilizing the biomass fuels available at the pulp mills.
Bubbling fluidized bed (BFB) and circulating fluidized bed (CFB) power boiler technologies for producing steam and electricity from renewable fuels, e.g. from biomass and biogenic residues and wastes.
Purification of raw methanol to obtain commercial-quality bio-methanol. In the kraft process, raw methanol is often used as an alternative fuel. Methanol is usually the last fossil-based chemical still used in a kraft mill, preventing the establishment of a completely fossil fuel-free mill.
The lignin recovery process can recover lignin from black liquor. This lignin can be used either to replace fossil fuels in the lime kiln or to generate additional revenue by selling it externally as a raw material for advanced bioproducts.
The sulfuric acid plant produces concentrated, commercial-quality H2SO4 on site by utilizing concentrated, non-condensable gases (CNCG). The technology is based on the wet-gas sulfuric acid (WSA) process. As H2SO4 is liquefied at 100% condensation, the sulfuric acid produced is classified as commercial grade. All sulfuric acid that a mill requires can be produced on site if the CNCG is co-combusted with elemental sulfur in the WSA plant.
Non-condensable gas (NCG) collection: treating and recovering mill gases to avoid odor emissions and comply with environmental regulations.
Chloride and potassium removal systems for removing chloride and potassium from the chemical recovery loop in order to keep these elements at manageable levels.
Flue gas cleaning plants such as wet and dry cleaning processes for acidic pollutant gases, plants to reduce nitrogen oxide emissions as well as combinations of complex flue gas cleaning technologies to be used in power plants, biomass plants, waste incineration plants and various industrial applications, and exhaust gas cleaning systems for the shipping industry.
Exhaust gas cleaning for maritime vessels: ANDRITZ has developed the SeaSOx scrubber technology for the maritime industry. It can be installed on all types of ships, either on a new build or retrofit basis.
Enhanced sustainability can be achieved by using autonomous cranes for log transportation in the woodyard. Crane operation is 100% fossil-fuel free and requires much less space than conventional solutions. Further energy efficiency in the woodyard can be achieved with a steam de-icing system in the debarking drum as well as high-capacity EXL and mega-sized HHQ chipper solutions.
The mobile chip laboratory evaluates the fiber potential of the wood chips, and the 360-degree stacker-reclaimer system ensures a homogeneous supply of wood chips to the digester, both of which increase the degree of utilization of the raw material.
Increased debarking efficiency with the Twin-RotaBarker provides several advantages in biomass handling and in the downstream energy conversion stream equipment. The BioCrusher reduces the particle size of the biomass, while the HQ-Press increases the energy value because more moisture is removed from the bark.
The Lo-SolidsTM cooking process is the key to high pulp yield and reduced chemical consumption in the bleach plant. It also reduces the consumption of refining energy due to its excellent pulp strength. The extremly high washing efficiency of the DD-Washer has a beneficial impact on both water and chemical consumption. The use of MC technology throughout the fiberline process also reduces power consumption. By recycling alkaline bleach plant filtrate to the brown stock washing plant and also recycling purified effluent, it is possible to minimize effluent volumes and overall consumption of fresh water.
The global demand for dissolving pulp is rising. With the A-ConFlexTM continuous kraft and dissolving pulp technology, customers can easily switch between market pulp for paper grades and dissolving pulp for textile fiber production. Dissolving pulp, which is spun into textile fibers such as viscose or lyocell, has a much smaller enviromental footprint than cotton or synthetic textile fibers.
A-ConCrystTM micro-crystalline cellulose is an addtional value-added bio-product that can be extracted from wood fibers in the fiberline process. Micro-crystaline cellulose (MCC) is a sustainable alternative to roughage in animal feed.
The EvoDryTM pulp drying system achieves a reduction in energy consumption of up to 3 kWh/ADT or 9 MW per day at an average production capacity of 3,000 t/d as well as up to 50% less fresh water consumption by reusing the press filtrates.
Pulp drying lines equipped with steam saving systems use heat from recovery boiler exhaust to produce low-pressure steam. This reduces the overall fresh steam and energy demand for the entire drying process.
Flash drying of pulp using maximum recirculation technology to minimize energy consumption and exhaust gas emissions to the atmosphere.
Water from the exhaust plume of the pulp drying line can be reused in the pulp mill after the water recovery process.